Sigma+ PCU is a solar power conditioning unit which is a single phase output, Inverter system. It works as a Bi-directional inverter which means power will be exported into the grid or power will be imported from the Grid.
The Sigma+ PCU work in two operating condition:
2. Grid Interactive
Stand-alone: Inverter operates from battery or array power source and produces AC output. Battery charged by solar (primary) & also from grid (secondary). Since usage of power from grid is secondary, grid power is only used when solar power is absent or below a certain level and battery voltage level reduces upto battery low status. Working Modes: Smart, PCU & Hybrid
Grid Interactive: Inverter operates from battery or array power source and produces AC output and also operates in parallel with the grid supply. Any excess solar power will be exported into the grid. Whenever sufficient solar power is not available to run the load, the required power is shared from the grid. The maximum power feed into the grid is depends on the system rating. Battery charging automatically occur from the grid to maintain the battery bank at its grid charging voltage. Working Modes: Grid Export Mode
| System Rating
|Operating DC Voltage
|Maximum PV Power Recommended
|PV Input Voltage (VDC)
|Solar Charge Controller Technology
|Solar Charge Controller Rating
|Max Load Current
|Grid Charging Option
|MCB for Solar, Battery & AC
|Output Supply Phase
||1 Ph IN & OUT
|IT Load/UPS Mode
|Output Voltage Low
|Output Voltage High
|Noise @ 1Mtr
Battery Health For Longer Life
The PCU feeds the battery installed to it a constant boost charging current until its voltage reaches 14.2V and the float current (which is very close to zero) then maintains this voltage above 13V. Thus reducing the float current ( flowing for the longest period during the entire process) to zero, ultimately resulting in much enhanced battery life keeping it fully charged simultaneously.
Extensive electronic protections
There are a number of protections that the PCU ensures. It stops reverse current flow from battery to solar array, it provides load short circuit protection, it provides Battery/Panel reverse protection through DC fuse and Overload protection also.
Utilizes maximum power available from the panel
The PCU senses the point of maximum power available in the panel and charges the battery with this maximum power. Therefore, the battery is always charged with maximum possible power at any given time. This is the feature that allows your device to work to its full capacity and thus deliver the best possible results.
Computer interface (Optional)
UTL PCU comes with an a